Abstract
Aims
Determining which abiotic and biotic factors influence soil aggregate stability (MWD) in tropical climates is often confounded by soil type. We aimed to better understand the influence of soil physical and chemical components, vegetation and fungal abundance on MWD of a Ferralsol along a successional gradient of vegetation in New Caledonia.
Methods
Five plant communities (sedge dominated, open sclerophyllous shrubland, Arillastrum forest, Nothofagus forest and mixed rainforest) were studied. For each community, MWD, soil texture, soil organic carbon (SOC), iron (Fe) and aluminium (Al) sesquioxides, root length density (RLD), specific root length (SRL), root mass density (RMD) and fungal abundance were measured. Generalized linear models were used to predict MWD from soil and plant trait data.
Results
The best prediction of MWD combined abiotic and biotic factors. Along the gradient, Fe increased MWD, while root traits, fungal abundance and SOC modified MWD. From the sedge-dominated community to Arillastrum forest, RMD and SOC increased MWD, while between Nothofagus and mixed rainforest, it was likely that floristic composition and fungal communities influenced MWD.
Conclusions
Plant community, the intrinsic nature of Ferralsol and fungal abundance all modified MWD. However, the specific effect of microbial communities should be addressed through a metagenomics approach to elucidate microbial interactions with plant communities.
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Abbreviations
- AM:
-
Arbuscular mycorrhiza
- ECM:
-
Ectomycorrhizal fungi
- MWD:
-
Mean weight diameter
- PCA:
-
Principal Component Analysis
- qPCR:
-
Quantitative PCR
- rDNA:
-
Ribosomal DNA
- RLD:
-
Root length density
- RMD:
-
Root mass density
- SRL:
-
Specific root length
- SLA:
-
Specific leaf area
- SOC:
-
Soil organic carbon
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Acknowledgements
We gratefully acknowledge the field staff of IAC (‘Unité SARA’): A. Bouarat, R. Guiglion, J.P. Lataï and A. Pain for their substantial assistance. We are thankful to our colleagues at IAC who gave substantial help for qPCR analyses: M. Lelièvre, K. Letellier, N. Robert, J. Soewarto and S. Gigante. We thank the US191 LAMA at IRD Nouméa who carried out the sesquioxides measurements. Fieldwork and laboratory analyses were funded by INRA, IAC and through a collaboration agreement between IAC and Société Le Nickel (agreement IAC-SLN n°DE2013-041). We thank the French Ministry of Agriculture for funding a PhD bursary (J. Demenois). Finally, we thank the anonymous reviewers for their helpful comments on the manuscript. In memoriam: we dedicate this paper to Christian Papineau who spent a large part of his life studying Arillastrum forests.
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Supplementary Fig. 1
Types of plant communities along the successional vegetation gradient from shrubland to forest. Retrocessions due to disturbances are not shown. (GIF 89 kb)
Supplementary Fig. 2
Non-metric dimensional scaling (NMDS) performed on Bray-Curtis dissimilarity indices for the five plant communities. S is Sedge-dominated formation; Mq is shrubland with Tristaniopsis glauca; Ag is Arillastrum forest; Na is Nothofagus forest and M is mixed rainforest. (GIF 17 kb)
Supplementary Fig. 3
Spearman correlations between soil characteristics, root traits and fungal biomass. *** indicates correlations with P < 0.001 for ρ > 0.7. The size of the circle is proportional to ρ. Abbreviations are: Fe2O3: Fe sesquioxides; Al2O3: Al sesquioxides; SOC: soil organic carbon; RLD: root length density; RMD: root mass density; SRL: specific root length; FR: % of fine roots, VFR: % of very fine roots. (GIF 63 kb)
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Demenois, J., Rey, F., Ibanez, T. et al. Linkages between root traits, soil fungi and aggregate stability in tropical plant communities along a successional vegetation gradient. Plant Soil 424, 319–334 (2018). https://doi.org/10.1007/s11104-017-3529-x
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DOI: https://doi.org/10.1007/s11104-017-3529-x